Mechanism for controlling electrically driven antenna

ABSTRACT

A control apparatus is placed in a drive circuit of a motor of an electrically driven antenna. The drive circuit is provided in parallel with a transmitter-receiver circuit of a transmitter-receiver, and an operation unit is provided so that control instruction can be given by manual operation to a control apparatus. The electrically driven antenna is extended or contracted by an amount determined by the instruction that is given from an operation unit interlocked with a turn-on or off of the power source of a transmitter-receiver. The control apparatus includes, for example, switch plates which are moved by a small motor. Variable contact pieces for the switch plates are adjusted by a manual operation unit to obtain a suitable control instruction through mechanical operation. Alternatively, the control apparatus can be operated electrically by using a control circuit and operation unit. The control apparatus can be placed inside and mounted on a car, and the amount of extension or contraction of the antenna can, selected as is necessary, by the operation unit.

DESCRIPTION

1. Technical Field

This invention relates to a mechanism for controlling an electricallydriven antenna. A motorized antenna control mechanism automaticallyextends and contracts an antenna connected to a wireless or radioreceiver and transmitter installed in an automobile. A mechanism forcontrolling the electrically driven antenna is operatively connectedwith the function of ON/OFF functions of the wireless or radio receiveras to freely extend and contract the antenna.

According to the present invention, simplicity of construction, isachieved, for example, by having a drive motor for a motorizedconnection driven by a two-wire connection. Also the device isrelatively easy to install to the car body without any adverse effectsof humidity, dust, and temperature condition or the like. Also mechanismdoes not suffer from effects of problems of the antenna, such asabnormal efficiency and deterioration of the power source.

2. Background Art

It is known that there are motorized antenna devices retractable bymeans of a driving device, such as a motor. According to theconventional motorized antenna device the antenna is actuated through achange-over switch situated in a motor vehicle interior. The switch isseparate from the switch of a radio receiver, so that a power source isconnected to the motor of the antenna.

In recent improved antenna devices, there are limit switches operate inresponse to the extension and retraction movements of the drivemechanism of the device. The extension and retraction movements of thedevice can be started automatically by ON-OFF operation of a radioequipped in a motor vehicle.

According to the prior art, a means other than that for operating thetransmitter/receiver is used. A change over switch is placed in the carinterior to which switch a power-to-motor supply cord of the motorizedantenna and the changeover switch is operated in manual. Also a limitswitch operated by rotation of the motorized antenna drive portion hadbeen built-in the drive portion. The mechanical conventional motorizedantenna portions automatically extend and contract by ON/OFF operationof the radio apparatus and stop by means of limit switches. The priorart is descrived, for example, in Japanese documents, Utility ModelPublication Sho. No. 43-17546, Utility Model laid-open Sho. No.50-54038, Utility Model laid-open Sho. No. 56-74505, and PatentPublication Sho. No. 60-57242.

Japanese Documents, Utility Model laid-open Sho. Nos. 49-145544 and57-171336 disclose obtaining pulse signals from a motorized antennadrive portion which is controlled automatically by an electronic circuitwhich in controlled in time and leg function of extending and extractingby means of a built-in timer circuit.

In every mechanism of the above-mentioned prior art, a control mechanismis installed in the antenna drive portion or integrated in the motorizedantenna. Accordingly, the antenna drive portion and the motorizedantenna portions are very complicated. Furthermore, the controller,which is built in the antenna portion is apt to be affected by raindrops, deteriorating the switch operation.

The conventional electronic-controlled antenna has a disadvantage oferror-functioning because of the effects of outside noise and electronicparts in the automobile. Also, the parts constituting the electroniccontrol mechanism are expensive, electronic circuits are complicated andof high quality, manufacturing of them is difficult. Except for ones ofa manual switch types or electronic control types, the extension lengthof the antenna corresponds to the distance determined by the built-inswitch exclusively. Accordingly, a convenient value of extensionsuitable to respective receiving condition or any necessity can not beobtained.

Because the control means is driven by the same motor as that used forextending and contracting the antenna, when the antenna mal-functions isover-loaded, or frozen the control means stops, which causes a burn-outof the motor. When the charging performance of a battery drops becauseof a cold environment of the battery sufficient and complete function ofthe controller is not obtained. There is a difference in operation ofthe controller in the high-voltage/hot environment and thelow-voltage/cold environment, so that shock applied to the antennaoperating wire during extension and contraction be made simple and towhich antenna a double-line cable of electricity can be connected tooperate the antenna driving motor. The motorized antenna controlmechanism described above can be attached to the car body withoutdifficulty and is not affected of humid air, dust, or bad weatherconditions. Furthermore, an operation of the control mechanism is notaffected by a failure of the antenna proper, overloading, and drop ofpower source.

A motorized antenna to be installed. It has been difficult to attain thesuitable and proper matching between the antenna operation and the motordriving for sufficient extension and contraction of the antenna.

When the antenna is in trouble or mal-functions, for example, it risesonly half or descend only half owing to freezing respective section ofantenna causing, over load condition the overload condition continuesuntil the switch is turned off.

In the conventional motorized antenna, the antenna drive portion and acontrol portion for it is integrally constructed, so that the user ofthe antenna suffers limitation in size and space with reference to thecar body structure and it is difficult to install it neatly.

Accordingly, the purpose of the present invention is to provide anautomatic antenna extension and contraction mechanism for atransmitter/receiver, such as car radio, which mechanism operates inconnection with the ON/OFF operation of the transmitter/receiver in carin order to make the antenna freely operable. The construction of themotorized antenna according to the present invention is simple, that isthe power source for the driving motor has an ordinal dual-wire typepower line and it can be manufactured in system mass-production systemand can be installed in a separately from the motorized antenna to becontrolled by the automatic antenna extension and contraction mechanism.

According to another object of the present application, is to providethe automatic antenna extension and contraction mechanism which is easyto install to the car structure and not affective by any environmentalconditions, such as severe conditions of humidity and temperature.

Another object of the present invention is to provide the controlmechanism for the motorized antenna operating without being effected oftroubles of the antenna, abnormal loading, and power performancedeterioration.

SUMMARY OF THE INVENTION

In accordance with the present invention, a control means is provided ina drive circuit for the motorized antenna motor arranged in parallel tothe circuit of of the receiver/transmitter. The circuit of course iscapable of receiving and transmitting. When a power ON-OFF switch forthe receiver/transmitter. A manpulator is provided to give manually thecontrol instructions to the control means attaining an extention andcontraction of the motorized antenna. These functions in cooperationwith the power ON-OFF operation for the transmitter/receiver, and thusthe particular length of extended or contracted antenna is directlyrelated with the instructions given through the control means.

According to the present invention, a control means is provided in adrive circuit for the motorized antenna motor installed in parallel withthe transmitter/receiver circuit. A power source ON-OFF switch of thetransmitter/receiver, as well as a hand cooperate to supply manipulationportion control instruction to the control means. A control meansdriving motor is provided separately from the motorized antenna motor asdescribed above as a mechanical control means operating in pursuance ofthe control instructions given from the manipulation portion, so thatthe motorized antenna motor and the control means drive motor areoperated in cooperation with the operation of the power source ON-OFFfor the transmitter/receiver, obtaining the length of extension andcontraction determined by the instruction given by the manipulationportion.

The control means mainly consists of a switch plate rotatably mounted bythe drive motor for the control means built in a case. A rotable portionmanipulatable by a manipulator situated outside of the case can bearranged on the switch plate as a movable contactor.

The switch plate has the first contact connected to the switch platethrough a circuit extending from the power switch of thetransmitter/receiver and relay circuit, the second movable contactconnected to an end of the power source through a changeover switch inthe relay switch, and a fixed contact connected to another end of thepower source. Respective movable contacts are operable by manipulatorsituated outside of the case.

The control means operating drive motor circuit for driving the controlmeans is placed parallel with the antenna motor driving portion in themotorized antenna motor driving circuit. A supplement circuit isprovided in the control means driving motor circuit by arranging a diodein parallel with a resistor in order to carry out extension andcontraction of the motorized antenna in cooperation with the ON/OFFoperation for the transmitter/receiver and to obtain the particularlength of extension and cotraction in accordance with the instructiongiven by the manupulator. The control means is driven by a flow ofcurrent through the diode when extending the antenna and through theresistance when contracting the antenna, so that the power necessarywhen contracting is small compared to the antenna.

An adjustable resistor is used for the resistance and it is adjusted andset in accordance with a selection of motor characteristics of themotorized antenna employed or change of voltage and temperature of thepower source, and a clutch operative condition.

In accordance with the present invention, an electric control apparatuscomprising the control means having a compulsory discharge circuit, aconstant current circuit, an integration circuit, a charge-dischargechangeover circuit, a constant current circuit, and a voltage comparisoncircit. In order to make a manipulator, a set-changeover detectingcircuit is connected to a standard voltage changeover circuit. Thesignal obtained by a cooperation of an analog control circuit andrespective function blocks is used as a control signal supplied to theantenna motor drive portion by manipulating the manipulator.

Notwithstanding whether, a mechanical control means or electricalcontrol means is used, only a control means is connected to the powerON/OFF circuit in the transmitter/receiver, such as of a car radio and apower supply cord for the motorized antenna drive motor is connected tothe output end of the control means, the antenna extends or contractsits particular length or distance in acordance with the instructiongiven by manipulation of the control means' manipulator.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 shows the general construction showing how to apply the controlto the motorized antenna,

FIG. 2 is a perspective view of the front portion of the manipulator inthe control mechanism according to the present invention,

FIG. 3 is an elevational sectional view of one example of the controlmechanism according to the present invention,

FIG. 4 is an elevational sectional view of another example,

FIG. 5 is an shows of a construction of a circuit of the presentinvention,

FIG. 6 shows another structure of the circuitry,

FIG. 7 shows the circuit construction explanation view of FIG. 5, but inwhich embodiment the antenna is fully extended,

FIG. 8 is the circuitry constructure explanation view when the antennaelements contract from their full extension condition to half extensioncondition and the circuitry has a separate supplement circuit at thesmall motor,

FIGS. 9-13 are the case of the electrical control system,

FIG. 9 shows the general relationship of still another embodimentaccording to the present invention,

FIG. 10 is a circuit structure showing the control means for the systemof FIG. 9,

FIG. 11 is an explanation of another embodiment of the circuit structureof the control means,

FIGS. 12 and 13 respectively show the embodiments employing DIP switchas a manipulator, and

FIGS. 14-16 each shows the embodiments of mechanical control system'stypical circuit structure connected securely to a car body.

DESCRIPTION OF PREFERRED EMBODIMENTS

This invention will be explained with reference to the accompanyingdrawings of FIGS. 1-16.

FIG. 1 is a general view of the whole structural relationship of anembodiment of mechanical control system. As shown, the motorized antenna2 attached to a car body plate 10 has a motor 4 and a controller 1 isconnected to the antenna 2 by means of a power supply cord 3 andattached to a dashboard in the car interior. The motorized antenna has aplurality of antenna elements 6a-6n which are telescopically expandableand contractable in a cylindrical antenna basement 5. As well known, theplural antenna elements have been operated by rotation of a drum 7through an operation wire. The drum 7 is driven by the antenna motor 4and contained in a case 8.

As shown in FIG. 2, the controller 1 has a manipulator portion 11 at itsfront face. By selecting the suitable position within the range of"BOTTOM" and "FULL" of the manipulator portion 11 according to theindication graduation 11a, the suitable length of the antennacorresponding to the position can be obtained. On the indicationgraduation 11a, the length of the antenna can be graduated by using theclassification of frequency to receive or to transmit excepting thesystem of "HALF" and "FULL".

The interior construction of the controller 1 is shown in FIG. 3 and itcontains a small motor 14 for driving switch plates 12, 12a of controlmeans. Although the power source for car electrical appliances hasordinarily DC12V, the small motor 14 is able to function by only theelectricity of DC6V and less. The motor 14 rotates the switch plates 12and 12a through a reduction 13 using, for example, warm geararrangements. Respective switch plate 12 and 12a is placed opposite andon both the sides of the dielectric plate 12b. In the circuitryconstruction shown in FIGS. 5 and 6 of the switch plates 12 and 12a, amovable contact 15, and fixed contacts 16, 16a and 16b are connected toan end of the supply power source through a change-over switch 22 in arelay circuit and the first movable 15a are connected to the circuit ledto the source switch through the relay circuit. The fixed contacts 16,16a and 16b are connected to the end of the supply power source or theearth side, the fixed contacts 16 and 16a are adapted to contact withthe switch plate 12a, and the mov-able contacts 15, 15a and the fixedcontact 16b are adapted to contact to the switch plate 12. One of themovable contact 15 contacts with a peripheral position of the switchplate 12 and the other contact 15a contacts with the inside position ofthe switch plate 12. The contacting positions of the movable contacts15, 15a are changed by means of the controller 11. The switch plates 12and 12a have respectively non-conductive portion 12', 12" and 12a'formed in the radius rotary area in which these movable contacts 15, 15aand the fixed contact 16 contact. It is apparent that the switch plate12, 12a may be placed at both sides of the dielectric plate 12b as shownin FIG. 3 or at either side of the plate as shown in FIG. 4 arbitrarily.As shown in FIG. 3 or 4, the controller 1 has a relay portion 17containing a relay mechanism 17a for driving respective motors 4 and 14in an ordinary direction and the opposite direction and the relaymechanism 17a is apparently operated by the receiver's power switch 21such as a radio as shown FIGS. 5 and 6. Furthermore, a voltagecontroller 18 is fixed to the small motor 14 and the rotary speed of themotor 14 is controlled by the voltage controller 18 to adjustcorrespondingly the value of extension and contraction of the antennaelements 6a-6n.

FIG. 5 shows an example of a circuitry used in the controller 1according to the present invention. The shafts of the movable contacts15, 15a are dielectrized and the rotary motions of the switch plate 12,12a are reduced in speed by the small motor 14. In the embodiment, asingle relay mechanism 17a of the relay portion 17 is employed. When thepower switch 21 of a radio is in OFF condition as shown, the relaymechanism 17a does not operate and the switches 22, 22a to be functionedby a relay operation are at their OFF condition to the power supplysource. In this condition, the controller 11 is accord with the "FULL"position and the antenna elements have its most extendable status. Thecontroller 1 has a terminal 24a connected to a lead line from the powerswitch 21 of the radio as an input terminal, a terminal 24b connected tothe power supply source, and a terminal 24c connected to an earth. Thereare terminals 19a, 19b used as outout terminals connected to the powersupply cord 3 of the large motor 4. The terminals 19a, 19b connected tothe small motor 14 are in parallel in order to rotate and stop the motor14 by the voltage control 18 connected to the large motor 4 in seriessimilar to that of the small motor 14.

FIG. 6 shows another relay portion 17 having both relay mechanisms 17a,17b. The relay mechanism 17b has a function changing-over the switch 23in a circuit connecting the motor 14 to the movable contact 15.

The detail of the embodiment mentioned above will be explained withreference to FIG. 5. In this embodiment, the power switch 21 of a radiois at OFF condition and the relay mechanism 17a does not operate.Accordingly, the switches 22, 22a to be operate by relaying are at OFFconditions to the switch plates 12, 12a preventing the motors 4 and 14from rotating and keeping the antenna elements in contracted condition.

When the power switch 21 of the radio is turned ON, the relay mechanism17a operates and the switches 22, 22a are changed-over, so that thecurrent flows through the circuit between terminals of the power supplysource, as a result the motor 4 on the paper rotates counterclockwiseand the motor 14 revolves clockwise. Owing to the clockwise rotation ofthe motor 14, the switch plate 12, 12a rotate on the paper clockwise andwhen they rotate about 180° full extension of the antenna elements 6a-6ncompletes.

Due to the full extension of the antenna elements, the movable contact15 contacts to the non-conductive portion 12' preventing the currentfrom the power supply source from flowing, so that these motors 4, 14stop in their rotation and these switch plates 12, 12a stop in theirrevolution.

When the power switch 21 of the radio is turned OFF, the relay mechanism17a stops and the switches 22, 22a return to the position shown in FIG.5 by the bold line (the movable contact 15 is at its non-conductivecondition). As a result, the flowing direction of current from thesupply power source to the motor 4, 14 is opposite in direction when theantenna is extending from that when the antenna extends. Thus, eachmotor 4, 14 rotates along the opposite direction, retracting the antennaelements 6a-6n and rotating the switch plate 12, 12a counterclockwise.The counterclockwise rotation of the switch plate 12a continues alongabout 180° of semi-circle until the non-conductive portion 12a' contactsto the fixed contact 16a, finishing the complete contraction of theantenna elements 6a-6n and obstaining the condition shown in FIG. 5.

The example described above, shows when the manipulator 11 is set at thefull extension position. However, the manipulator 11 is set at anyhalfway position other than "FULL" position mentionedabove, the motor 4,14 stop at the position before the movement reaches 180°. So that, theantenna elements 6a-6n stop halfway in their extension and start theircontraction. As shown by way of example in FIG. 2, when the manipulator11 is set at "HALF" position, rotation of the motor 4, 14 rotates theswitch plates 12, 12a along about 90° to have the movable contact 15contact the non-conductive portion 12'. As a result, the motors 4, 14halt their rotation, stopping the extension of the antenna elements6a-6n and rotation of the switch plates 12, 12a, being stopped theantenna is at its middle position. When the power switch 21 of the radiois turned OFF after that, the antenna elements 6a-6n which have beenextended to the halfway position back to the complete contractioncondition as shown in FIG. 5 due to the reverse rotation of the switchplates 12, 12a from their halfway position.

FIG. 8 depicts the case in which the power switch 21 of the radio iskept in an OFF condition and the extension position of the antennaelements changes from a full to a halfway position. The manipulator 11which have been set at the full extension position is set at a halfwayextension status, thus the mavable contact 15a contacts with thenon-conductive portion 12" formed inside diametrically of the switchplate 12 connected to the power source through the relay mechanism 17a,cutting the current flow through the switch plate 12. Accordingly, therelay mechanism 17a is made non-operative and the switches 22, 22achange-over from the contacted condition at the upward condition to thedownward condition, forming a reverse circuit led to the power sourceopposite to that of the antenna reversing the motors 4, 14 to retractthe antenna elements 6a-6n. When the switch plate 12 returns to itshalf-way position set, the non-conductive portion 12' contacts themovable contact 15, the motors 4, 14 halt at the present position, andthe antenna elements 6a-6n stop at the halfway position set to receiveradio wave.

When the antenna elements have their halfway extension condition asdescribed above, the movable contact 15a positioned inside diametricallyof the switch plate 12 has current-flowing condition therethroughrepeatedly. As a result, current flows through the relay mechanism 17aand the switchwes 22, 22a are changed from the depicted lower contactedposition to the upper contacted position. The power source circuit ofthe switch plate 12 is at non-current condition, stopping motors 4, 14and halting the switch plates 12, 12a.

The halfway position does not mean only the "HALF" position shown inFIG. 2 but means any positions between ends. That is any halfwayposition of the antenna can be selected and the antenna elements extendsto the particular or arbitrary position and contacts from that position.

The operation mentioned above can be obtained in the circuit shown inFIG. 6.

That is, as shown in FIG. 6, under the condition of that the antenna hasbeen contracted and stopped, the manipulator 11 rotates to its fullextension position, and the movable contacts 15, 15a are brought to theshown positions, when the receiver's power switch 21 is turned ON, therelay mechanism 17a operates, changing-over the power switches 22, 22a.Consequently, a circuit from the power terminal 24b to an earth terminal24c through the relay mechanism 17b is formed, placing the relay switch23 ON and forming another circuit from the power source to the earthterminal 24c through each of motors 4, 14, the movable contact 15, therelay switch 23, and the switch plate 12. Due to the operation describedabove, the antenna starts in its extension and switch plates 12, 12abegins on their rotation (on the paper clockwise).

After respective switch plates 12, 12a rotate for about 180° angulardegree to fully extend the antenna, the non-conductive portion 12'contacts with the movable contact 15 preventing current from flowing tothe motors 4, 14 through the movable contact 15 and keeping the antennasections 6a-6n at their full extension condition. At the time, currentflowing is continued to the relay 17a through the movable contact 15aand the switches 22, 22a are kept at their positions changed changed, asshown by imaginaly lines in FIG. 6 to keep current flowing through thepower source relay 17b. Turning the receiver's power switch 21 OFF cutscurrent flow through the relay 17b. When the power switches 22, 22a arechanged to their positions as shown by bold lines in FIG. 6, currentflow to the relay 17b is change OFF making the switch 23 OFF conditionand cutting current flow through the switch plate 12. The current inopposite direction to that when the antenna extends, flows to bothmotors 4, 14 through the contacts 16, 16a on the switch plate 12a torotate the motors along the opposite direction and to rotate the switchplates 12, 12a counterclockwise, attaining contraction of the antenna.After a completion of antenna contraction and a counter-rotation of theswitch plates 12, 12a for about an angle 180° on the drawing, the switchplates 12, 12a return to the condition shown in FIG. 6.

Setting the manipulator 11 from the position above to the half-extensionposition, the movable contacts 15, 15a are made at their verticalposition in FIG. 6. When the receiver power switch 21 is turned ON withthe manipulator 11 being set its half-extension position, current flowsto the relays 17a, 17b and the motors 4, 14 to extend the antenna and torotate the switch plates 12, 12a. However, because the movable contacts15, 15a are kept at the half position, when the non-conductive poriton12' of the switch plate 12 reaches the position of the movable contact15, current being earthed from the motors 4, 14 through the movablecontact 15 is stopped to halt the motors 4, 14 and the antenna at itshalf extension position. In order to fully extend the antenna or fullycontract it from its half extended condition, the manipulator 11 isrotated to set the movable contacts 15, 15a at any positions. Theoperation obtained after the setting above is apparently the same as theoperation of the last step in the full extension step or the contractingstep from its full extended condition. The operation of the antenna fromits full extension condition to its half extension one will bedescribed. When the receiver power source switch 21 is in the ONcondition, the movable contacts 15, 15a are set at their intermediateposition by operation of the manipulator 11, movable contact 15a extendsfully to contact with the non-conductive portion 12" situated in itslower half position. As a result, the relay 17a is made inoperative andthe switches 22, 22a are placed at the positions shown by bold lines inFIG. 6, making the switch 23 OFF. Current flows to each motors 4, 14from the power switch 22a through the contacts 16, 16a on the switch 12ato rotate the switches 12, 12a counterclockwise for about 90°,contracting the antenna to its middle position. Thus, the non-conductiveportion 12" of the stopped switches 12, 12a is retreated from itscutting-off condition of the movable contact 15a. The relays 17a, 17bare in their operative condition, taking power switches 22, 22a theirdotted line positions. Because the movable contact 15 is locatedsituates on the non-conductive portion 12', the antenna is held at itshalf contracted position.

The rotary angle of the manipulator 11 from "BOTTIOM" to "FULL" and therotating range of switch plates may be selected at will so as tocorrespond with the employed motorized antenna by selecting the speedreduction ratio and adjusting the voltage controller 18.

As depicted in FIG. 8, with reference to the small motor 14 operatingthe control means, a correction circuit consisting of a variableresistors 18, 25 and a diode 26, respectively arranged in parallel isused. In order to protect the contacts, a circuit having a capacitor 28and a resistor 29 arranged in series is placed in to the circuit fordriving the small motor.

By appropriately adjusting and setting the variable resistor 25, it isfreely applied to the change of motor characteristics of the usedmotorized antenna and power source voltage and pulsation. Somedifference in operative time of the motor 14 between the times ofantenna extension and contraction may be used to effectively solve aproblem of incomplete contraction of the antenna. Also, it is possibleto suitably select an operation of the clutching mechanism.

By forming the correction circuit on the small motor 14, which circuithaving a variable resistor 25 and a diode 26 placed in parallel, whenthe antenna sections 6a-6n extend, current flows through the diode 26 todrive the motor 14. When the power switch 21 is turned OFF and theantenna sections 6a-6n contract, current flows through the variableresistor 25 to drive the motor 14. It is apparent that the rotary speedof the motor 14 in the former case in faster than that in the lattercase. Comparing to that the operative speed of the motor 4 with incomparison to the antenna sections 6a-6n is the same, the driving speedof the controllable switch plate during extending is always higher thanthat during contracting. Accordingly, a contraction of the antenna owingto the motor 4 lasts for the longer time, so that the antenna sectionsmay be in the complete extracted stored condition without fail.

Because that resistant value of the variable resister 25 may be changed,the retarded or elongated time gap between when the antenna extends andwhen it contracts can be controlled at will, so that it can be appliedto any changes of the characteristics and the like of the motor.

The various embodiments of the present invention are shown in FIGS.14-16 and they are the motorized antenna equipped in ordinary manner. Inthe embodiment depicted in FIG. 14, a circuit 30 connected to atransmitter/receiver apparatus such as a radio has a diode 37 to protectthe radio, and a switch 35 is given in a power circuit 31, which switch35 is adapted to be operated by relay 36 installed in a starter circuit32. Making the starter circuit 32 ON, the power circuit is cut toprohibit the antenna drive system from erroneous functioning.

Another embodiment shown in FIG. 15 is a switching transistor circuithaving, in addition to the structure of the embodiment in FIG. 14, a setof resistors R₁ and R₂ fixed to the circuit 30 from thetransmitter/receiver apparatus, which resistors R₁ and R₂ are given to atransistor Tr₁. Even the control signal from the circuit 30 is weak,installation of the switching transistor circuit make it possible toobtain an effective function of the relay 17a.

Further, in the embodiment of FIG. 16, in place of the starter circuit32 shown in FIG. 15, an ignition circuit 33 and an accessary circuit 34are used and transistors Tr₂, Tr₃ and resistor R₃ -R₆ are inserted inthe circuits 33, 34 mentioned above to form a judgement or decisioncircuit. The decision circuit selects the signal on both the circuits33, 34 in order to operate the power source circuit 31 through the relay36 as like in the embodiment of FIG. 15.

The embodiment shown in FIGS. 14-16 is similar to that of FIG. 5. Incase the relay 17b is used as in the embodiment of FIG. 6 or in case ofthe embodiment shown in FIGS. 9-13, the circuitry structure shown inFIG. 14-16 is employed.

Another embodiment as shown in FIGS. 9-13 will be explained withreference to the figures. FIG. 9 depicts an outline of a motorizedantenna, in which the transmitter/receiver apparatus 50, such as a radioconnected to a power source 5 has a switch 21 and this switch connectsto a transmitting receiving circuit in the apparatus 50 and to a controlmeans 1. An output terminal of the control means 1 is connected with themotor 4 of the motorized antenna 3 to obtain a motor driving circuit. Amanipulator 11 is installed to the control means 1 above and controlinstructions are obtained through the manipulator 11. As a manipulator11, one of slide type may be used in the embodiment of FIG. 9, exceptfor the rotary type shown in FIG. 9.

An embodiment of the circuit structure of the control means 1 is shownin FIG. 10, to the control circuit 40, a complusory discharge circuit41, an integr-ation circuit 42, a charge-discharge changing circuit 43,a constant current circuit 44, and a voltage comparison circuit 45 areconnected as shown. As shown by the manipulator 11 in FIG. 10, a settingchange detecting circuit 60 and a standard voltage change-over circuit61 connected thereto is employed, using the signal obtained bycooperation of the analogized control circuit and respective functionalblocks as a control signal to be sent to the motor 4 through amanipulator 11.

The compulsory discharge circuit 41 compulsorily discharges the currentcharged in the integration circuit 42 in accordance with instructions ofthe control circuit 40 to make output voltage (V_(f)) of the integrationcircuit 42 zero (0). The integration circuit 42 integrates charging anddischarging current from the charge-discharge change circuit 43 toimpress charge voltage (V_(f)) to the voltage compulsory circuit 45. Thecharge-discharge change circuit 43 changes-over charging and dischargingof the integration circuit 42 in accordance with the instructions of thecontrol circuit 40. The constant current circuit 44 supplies a constantcurrent to the integration circuit 42 through the change circuit 43 tomake a charge-discharge voltage characteristic for time of theintegration circuit 42 constant (linear). The voltage comparison circuit45 compares charge voltage (V_(f)) with the standard voltage (V_(y)) tooutput a logic "1" when V_(f) >V_(y) and a logic "0" V_(f) ≦V_(y) to acontrol circuit 40.

The standard voltage change-over circuit 61 impresses either one of anoutput voltage V_(x) from the antenna position setter namely themanipulator 11 or a signal output V_(z) =0(V) from the control circuit40 to the voltage comparator 45 as the standard voltage V_(y). Thechanged setting detecting circuit 60 detects the increment or decrement(± differential) of the output voltage V_(x) from the manipulator 11 forsetting the antenna position to output it to the control circuit 40. Themanipulator 11 output a voltage V_(x) which corresponds to the antennaposition desired by a user. The voltage V_(x) is obtained as shown bychanging the contacting position of a movable contactor relative to aresistor. The control circuit 40 controls respective functional blocksabove according to the ON-OFF condition of the radio switch and settingof downing signal (DWS) and to automatically contact and extend theantenna.

The operation of the control circuit 40 will be explained. The powersource being ON, the control circuit 40 discharges electricity on theintegration circuit 42 through the compulsory discharge circuit 41 toimpress V_(f) =0(V) on the voltage comparing circuit 45 and impressV_(y) -V_(x) on the circuit 45 through the standard voltage changecircuit 61. Also, the control circuit 40 makes the signals (UPS) and(DWS) OFF of the initial condition. When the radio switch is turned ONand manipulator 11 is set at the zero position [V_(y) =V_(x) =0(V)],control circuit 40 changes over the charge-discharge change-over circuit43 to its charge side, however V_(f) =V_(y) =0(V), so that the output ofvoltage comparator circuit 41 is 0, and the signals in the controlcircuit 40 become OFF statuses of the inicial condition keeping theantenna at its stationaly status. On the contrary, when the manipulator11 is set at its initial position [V_(y) =V_(x) =Y₁ (V)], the controlcircuit 40, being received ON of the radio switch, changes over thechange-over circuit 43 to the changing side. Because V_(f) <V_(y) [Y₁(V)], the output of the voltage comparator circuit 45 becomes 0, makingthe signal (UPS) of the control circuit 40 ON. As a result, the antennastarts its raising motion. The integration circuit 42 begins itscharging of the constant current from the constant current circuit 44 toincrease V_(f). When an equation of V_(f) >V_(y) is obtained, the outputof the voltage comparator circuit 45 becomes "1", the control circuit 40halts a raising signal (UPS) to stop the antenna at this time. Thedistance of the antenna moved for the passage of the time corresponds tothe desired position of the antenna extension and contraction.

When the setting position of the manipulator 11 is changed to the upwardside [V_(y) =V_(x) =Y_(z) (V), Y₂ >Y₁ ], the changed setting detectingcircuit 60 detects the changed setting position to output an incrementdirectional change signal. The control circuit 40 receives this changesignal to change the charge-dischange change-over circuit 43 to a chargeside. At the time, the control circuit 40 receives the change signal andan output O (V_(f) <V_(x)) of the voltage comparator circuit making theraising signal (UPS) ON. Similarly to this operation, after the passagecorresponding to Y₂ -Y₁ (V) elapses an equation of V_(f) >V_(y) isobtained, becoming an output of the voltage comparator circuit 45 "1"and the raising signal of the control circuit 40 OFF.

When the setting position of said manipulator 11 is changed [V_(y)=V_(x) =Y₃ (V), Y₃ <Y₂ ], the changed setting detecting circuit 40detects the change to output a downward direction changing signal, whichreceived by the control circuit 40 to change over the charge-dischargechange-over circuit 43 to a discharge side. Then, the control circuit 40receives an output "1" (V_(f) >V_(y)) of the voltage compalator circuit45, making down signal ON and starting the antenna in its downwardmovement. The integration circuit 42 begins discharging the constantcurrent from the constant current circuit 44, decreasing V_(f). WhenV_(f) becomes V_(y), the output of the voltage comparator circuit 45 ismade zero, the control circuit 40 makes down signal (DWS) OFF haltingthe antenna instantly. It is apparent that this halt position of theantenna is determined by the distance of movement corresponding to thetime passage integrated from 0 to Y₃ (V).

When the radio switch is turned OFF, the control circuit 40 changes overthe charge-discharge change-over circuit 43 to its discharge side andmakes a standard voltage V_(y) of the voltage comparator circuit 45V_(z) =0(V) by means of the standard voltage change-over circuit 41.Consequently, the output of the circuit 45 becomes "1" (V_(f) >V_(y))the control circuit 40 makes a down signal (DWS) ON, descending theantenna. Electricity of the integration circuit 42 begins to dischargeat a constant current from the constant current circuit 44, decreasingV_(f). When an equation of V_(f) =V_(y) =0(V) is attained, the controlcircuit 40 makes a downsignal OFF. As a result, the antenna halts at itsinitial position and the control system of the present invention obtainsits initaial status.

On the other hand, although the case in which the antenna length isdiffered according to the kind of antenna as shown in FIG. 10 employs aparticular setting circuit and FIG. 10 omitts the setting circuit, afull-scale setting circuit may be added to the manipulator 11 to changethe full-scale of V_(x) according to the antenna length. Conventionaldevices, such as compensating circuit for changes of power sourcevoltage, temperature and humidity, and offset are omitted.

Another embodiment of specific circuitry of the controller 1 is shown inFIG. 11. As usual, a voltage V_(x) corresponding to the extended lengthof the antenna is output by using the manipulator 11 for setting theantenna position. The manipulator 11 has an A-D converter 70 which isconnected to a control circuit 40 and an A-D data latch circuit 51.Also, the control circuit 40 is connected to an A-D data memory circuit52, a comparator 53, and a memory circuit 54 for antenna's presentposition, and these parts are connected to each other as shown. Adiscrete set-change detecting circuit 55 is connected to the controlcircuit 40 and between both the parts 51 and 52, 52 and 53.

According to the instructions (ADS) from the control circuit 40, the A-Dconverter 70 starts its converting operation. When the operationcompletes, the A-D converter 70 outputs a convertion completion signal(EOS) into the control circuit 40 and outputs digital data to the A-Ddata latch circuit 51 as well. The A-D data latch circuit (DLT) 51latches digital data from the A-D converter 70 according to theinstructions (DLE) of the control circuit 40. The set-change detectingcircuit 55 calculates data of the A-D data latch circuit 51 and the A-Ddata memory circuit (ADM)52 according to the instructions (CMS) of thecontrol circuit 40 by using the following equations (I, II):

    ADM≧DLT-OFS                                         I

    ADM≦DLT+OFS                                         II

Only when both the equations are satisfied, a signal (SCS) makes itssignal a logic "0", and others make a logic "1", then outputs thedelection completion signal (DES) into the control circuit 40.

In order to prevent the motorized antenna from vibrating due to any A-Dconversion error, the set-change detecting circuit 55 moves the antennaonly when the A-D conversion data larger than a certain off-set value(OFS). If an antenna position setter (APS) corresponding to themanipulator 11 is a digital type one (for example, a dip switch), theset-change detecting circuit 55 is not necessary. In this case, it isapparent that the A-D data latch circuit 51 additionally is notnecessary.

The A-D latch memory circuit (ADM) 52 stores the data of A-D data latchcircuit 51 in accordance with the instructions (DME) of the controlcircuit 40. The comparator 53 always compares data of the A-D datamemory circuit (ADM) 52 with data of the antenna's present positionmemorizing circuit (RPR) 54 to output three kinds of information ofADM>RPR, ADM=PRP, ADM<RPR respectively to the control circuit 40. Thecircuit (RPR) 54 memorizes data of the antenna's present positionaccording to the instructions of a clock (CLK) and anaddition-subtraction signal (UDC). The control circuit 40 has beenexplained with reference to FIG. 10, to which an oscillat- or (OSC) forgenerating the standard clocking pulses is attached.

The embodiment shown in FIG. 11 will be described. Closing the powersource, the control circuit 40 re-sets the latch circuit 51, thesetting-change detecting circuit 55, data memory circuit 52 theantenna's present-position memory circuit 54 and makes the rising signal(UPS) and the descending signal (DWS) OFF-condition, restoring them totheir initial condition. When the radio switch is turned on and the setof the manipilator 11 is at 0-position [V_(x) =0(V)], the controlcircuit 40 instructs a start of A-D conversion to the A-D convertor 70.The convertor 70 outputs an A-D conversion complete signal (EOS) to thecontrol circuit 40 and a data (all zero). Then the control circuit 40outputs an instruction (DEL) to make the data of the A-D convertor 70latched in the A-D data latch circuit 51 and to operate the settingchange detecting circuit 55 according to the signal (CMS). The detectingcircuit 55 substitutes the data (DLT) of the A-D data latch circuit 51and other data (ADM) of the A-D data memory circuit 52 in the equationsI and II previously mentioned and calcuates the equations. The data(DLT) and (ADM) are respectively zero. Completing the calculation, thedetecting circuit outputs a signal (SCS) "0" (the output of the A-D datalatch circuit=the output of the data memory circuit 52=all zero,satisfying the equations I and II) and a detection completion signal(DES) to the control circuit. The control circuit 40 judges that thereis no change in setting, keeping the raising signal (UPS) and thedescending signal (DWS) at their initial namely OFF position and holdingthe antenna portions at the halt position. When the manipilator 11 isset at the desired position [V_(x) =Y₁ (V), the digital value DY₁ for Y₁is larger than an off-set value (OFS)] and the radio switch is ON, thecontrol circuit 40 instructs a start of A-D conversion to the A-Dconvertor 70. The convertor 70 outputs an A-D conversion completionsignal (EOS) to the control circuit 40 as well as a digital data (DY₁)corresponding to V_(x). According to the A-D conversion completionsignal (EOS) from the control circuit 40 output the instruction (DLE) tomake the data of the A-D convertor 70 is latched to the A-D data latchcircuit 51. According to the signal (CMS) from the control circuit 40,the set-change detecting circuit 55 operates. The set-change detectingcircuit 55 substitutes the datas (DLT), (ADM) of the A-D data latchcircuit 51 and the A-D data memory circuit 52 for DLT and ADM in theequations I and II and calculates them. Completing the calculation, thesetting-change detecting circuit 55 outputs the signal SCS "1" [theoutput (all zero) of the A-D data memory circuit 52<DY₁ +off-set value(OFS)] and the detection completion signal (DES), respectively to thecontrol circuit 40. Owing to the signal SCS "1", the control circuit 40instructs an instruction DME to memorize the data of the A-D data latchcircuit 51 in the A-D data memory circuit 52. All processes mentionedabove are excuted periodically, on ON of the radio switch, due to theinstruction of the control circuit 40. However, the instruction DME ofthe control circuit 40 memorizes the data of the A-D data latch circuit51 to the A-D data memory circuit 52 only when the signal SCS "1" isissued. Here, the output of the comparator 53 has the condition of theA-D data memory circuit: ADM 52 (DY₁)>the antenna's present positionmemory circuit: RPR 54 (all zero) so that the control circuit 40 judgesthat the set-change directs to increasing direction to make the raisingsignal (UPS) ON, raising or extending the antenna. Simultaneously, theaddition-subtraction signal (UDC) is made "1" (the antenna's presentposition memory circuit 54 carries out its addition) to raise theantenna and to count the clock pulses of the antenna's present positionmemory circuit 54 by means of a clock. After the time of DY₁ is clocked,the output of the comparator 53 shows that the data (ADM) of the A-Ddata memory circuit 52 equals the data (RPR) of the antenna's presentposition memory circuit 54. Then, the control circuit 40 makes theraising signal (UPS) OFF to stop the antenna. The length of the antennacorresponds to the length of clocked time. When the set position of themanipulator 11 is changed toward the raising end [V_(x) =Y₂ (V), Y₂ >Y₁,DY₂ -DY₁ > off-set balue (OFS)], the control circuit 40 excutes the samejudge and operation as described above because the signal SCS equals alogic "1". Thus, the control circuit 40 continues to output the raisingsignal (UPS) for the clocked time of DY₂ -DY₁ to raise the antenna. Incase that the manipulator 11 is changed of its set position toward thedown end [V_(x) =Y₃ (V), Y₃ <Y₂, DY₂ -DY₃ > off-set value (OFS)], thecontrol circuit 40 periodically outputs the downing signal from theinstance of issuance of the instruction ADS to that of receipt of thedetection completion signal (DES) during ON of the radio switch. In thiscase, the signal SCS is made a logic 1 [the A-D data memory circuit 52'sdata (ADM) (DY₂)>DY₃ - off-set value (OFS)], the control circuit 40issues instruction (DME) to memorize the data of the A-D data latchcircuit 51 in the A-D data memory circuit 52. Then the output of thecomparator 53 shows that the data (ADM) (DY₃) of the A-D data memorycircuit 52 is smaller than the data (RPR) (DY₂) of the antenna's presentposition memory circuit 54, so that the control circuit 40 concludesthat the set has been changed toward a reduction end, issuing a downsignal (DWS) to descend the antenna portion and making theaddition-substraction signal (USC) a logic "0", [the antenna's presentposition memory circuit 54 operates its subtraction operation], so thatthe clock (CLK) clocks the antenna's present position memory circuit 54.After the time duration corresponding to DY₂ -DY₃ has elapsed, theoutput of the comparator 53 indicates that the data (ADM) of the A-Ddata memory circuit 52 equals the data (RPR) of the antenna's presentposition memory circuit 54, control circuit 40 starts the down signal(DWS) OFF to stop the antenna at the position. It is apparent that thetravel ed distance of the antenna corresponds to the time elapsed fromthe zero position to Y₃ (V) (DY₃). If any error is generated in the A-Dconversion operation and the control circuit 40 outputs DY₄ [DY₃ -DY₄<off-set value (OFS)] in spite of the correct setting of the manipulator11, the following equations are satisfied. ##EQU1##

As a result, the signal SCS is made "0", the control circuit 40 does nottransmit the data of the A-D data latch circuit 51 to the A-D datamemory circuit 52, keeping the control of the circuit 40 by means of theA-D conversion data previously stored in the memory circuit 52.Consequently, the antenna cannot move if the A-D conversion error isoccured.

Opening the radio switch, the control circuit 40 resets the A-D datamemory circuit 52. The output of the comparator 53 indicates that thedata output (all zero) of the A-D data memory circuit 52 is smaller thanthat of the antenna's present position memory circuit 54 (DY_(n)), sothat the control circuit 40 outputs a down signal (DWS) to make descendthe antenna. At the same time, the control circuit 40 makes theaddition-substraction signal (UDC) a logic "0" (the antenna's presentposition memory circuit 54 operates its subtraction operation), to clockthe memory circuit 54 by means of a clock. After the time elapsecorresponding to DY_(n), the output of the comparator 53 shows that thedata (ADM; all zero) output from the A-D data memory circuit 52 is equalto the data (RPR; all zero) output from the antenna's present positionmemory circuit 54, and the control circuit 40 makes the descendingsignal OFF, stopping the antenna. At this time, the antenna is stoppedat its initial position and the control system for the motorized antennamoves to its initial condition.

Although the antenna position setting circuit used in case of differentantenna structure having a different antenna length is omitted in FIG.11, it is easy to understand that a full-scale setting circuit may beattached to the antenna position setting device, such as the manipulator11, so as to change the full-scale, according to the antenna length. Incase that the antenna position setting device or the manipulator 11operates in a digital manner, a full-scale change circuit may beinstalled between the digital setter and the A-D data latch circuit 51.

The controlling system for the motorized antenna according to thepresent invention can be excuted with a microprocessor. Since variousMPU and MCU having different functions are on the market, the carry outthe present invention suitable electric parts can be selected. Also, anyinput/output device can be selected in order to determine the particulardevice suitable to the situation. With reference to the softwere, aprogram f or excuting the controller system can be fabricated in orderto effectively operate the controller system.

In the controlling system shown in FIGS. 10 and 11, the manipulator 11can be replaced by other devices. For example, of a DIP switch 39 ofdigital setting part as shown in FIG. 12. Also, it is possible toinstall a DIP switch 39 in a frequency receiving mechanism 50 containinga receiver circuit 38 as shown in FIG. 13.

The effects which are obtained from embodiments of the present inventionwill be described as follows:

I. A simple device source for a motorized antenna apparatus can beobtained. Because that the controller and the antenna driving mechanismare fabricated and installed individually and separately, a constructionof the antenna driving mechanism is made simple and also that of themotorized antenna is simplified. Consequently, instead of theconventional manually operated change switch of motorized antenna in acar interior, the present invention uses a simplified construction ofthe antenna driving mechanism.

II. The controller can be installed in a car or motor vehicle interior.According to the present invention, the controller can be fixed around adriver's seat, for example, on a dashboard to which the driver can reachfor the controller. Thus, there is little chance of the controller to beaffected by rain and other enviromental conditions. Additionally, thecontroller is not affected by outside noise or by the electric system inthe automobile.

III. Various length of the antenna suitable to the various receivingcondition can be used. According to the present invention, the controlapparatus for the motorized antenna uses a rotary switch and theposition of the movable contactor on the rotary switch can be set easilyby operation of the manipulator. As a result, the particular antennalength suitable to particular frequencies of AM, FM and TV can beobtained without difficult. When the control apparatus is used for amulti-frequency common-use antenna, particular frequency can be easilyobtained.

IV. Reviewing of signals can be attained in the strong or the weakelectric fields.

Because that the present motorized antenna can attain any length of theantenna as described above, suitable and preferable receiving can beaccomplished where these are in strong or weak electric fields.

V. The operation of the controlling mechanism is not effected by anytrouble or malfunctioning of the antenna, low temperature condition, andpulsation of the voltage source.

According to the present invention, the motor 4 for antenna driving isseparated from another motor 14 for driving the controller. Accordingly,motor 14 is effected by some abnormal loading, such as troubles causingmalfunction, or freezing of the antenna. In the prior art, when theabnormal loading is affected as mentioned above, a limit switchfunctions resulting in burning of the motor. According to the presentinvention, a limit switch doesn't function in the condition above and asa result, the motor doesn't burn.

The controller driving motor functions at smaller load and smallercurrent than the antenna driving motor, so that the controller drivingmotor can function by half the power of a car battery of DC 12 V. In acold area, the switching operation of the controlling mechanism can beattained effectively.

VI. Having good resetting function.

In the prior art, when the antenna elements or rods are frozen, theycannot rise or go down at the half-way position. When such a fixedcondition of the antenna rods happens it has been difficult to restorethe normal operating condition.

In the present invention, when the controller is positioned at the fullextension position after the cause of malfunctioning is solved, the nextoperation of the radio power switch (OFF when the antenna stops at halfraising after ON operation, or ON when it stops at half descending afterOFF operation) automatically. Operates the controller for raising orlowering the antenna to its raised or lowered position.

When the antenna is intended to go up or down automatically to its halfor intermediate position and the above-mentioned malfunctioning hashappened, the controller is set to its full extension position (resetposition) to function a reciprocation of the antenna and to restore itto its normal condition. After the resetting operation above, anyintermediate position of the antenna can be freely set by resetting it.

VII. Alternations of power voltage and motor characteristics are copedwith effectively.

Because a supplemental circuit has a variable resistor 25, it ispossible to suitably regulate and set a timing of the switch operationof the controller so as to correspond to the operating time of theantenna and synchronize the antenna drive motor with the controllerdrive motor and freely correspond to power voltage alteration andcharacteristic change of any commercial motor due to the change ofweather.

In the conventional charge and discharge timer provided with condensersand resistors, it is apt to change the operation time of raising anddowning antenna due to voltage alteration and temperature change (whenlow voltage uncomplete extension and constraction happens, and when highvoltage over clutch operation happens). According to the presentinvention, the operation time of antenna is always stable.

VIII. Antenna always contracts completely.

In the conventional antenna automatic extension and contractionmechanism, due to particular characteristics of the antenna drive motor,lowering or raising of the antenna, and operation gap in the clutchmechanism, some difference is generated between the raising and thelowering times of antenna. Consequently, the control switch is turnedOFF before the antenna is fully contracted.

According to the present invention, the supplemental circuit regulatesthe operating times of the antenna drive motor and the controllermechanism drive motor to lengthen in general the downing time thanraising time by about 0.2-0.5 second to solve the problem above.

IX. Clutch mechanism can be operated suitably.

In the present invention, after that the supplemental circuit selectsstrictly the time the antenna needs to complete the raising of antennaand the time in which the controller operates, the controller operatesthe motorized antenna without noise of clutching. It may be possible togenerate some clutching sound making the operator known of thecompletion situation.

We claim:
 1. A mechanism for controlling an electrically driven antennacomprising;a transmitting and receiving circuit; an antenna motor powersupply circuit operatively connected in parallel with the transmittingand receiving circuit; independent contactor control means including arotary contactor with a motor, for responding to control commands, givenby a manipulating portion; the manipulating portion for giving thecontrol commands to said independent contactor control means, saidmanipulating portions adapted to pre-set selected amounts of antennaextension and contraction in said independent contactor control means;and a changeover means for performing ON/OFF operations for currentsupply to the antenna motor power supply circuit, the motor of theindependent contactor control means and the transmitting and receivingcircuit, so as to extend and contract the antenna according to thecontrol commands.
 2. A mechanism for controlling an electrically drivenantenna comprising:a transmitting and receiving circuit; an antennamotor power supply circuit operatively connected in parallel with saidtransmitting and receiving circuit; independent control means forresponding to commands, located in a case which includes a rotatableswitch plate and a motor for rotating the switch plate, said controlmeans having a rotary contactor connected to the antenna motor powersupply circuit; a movable manipulating portion for operating the switchplate from outside the case; and changeover means for performing anON/OFF operation of the antenna motor power supply circuit, theindependent control means motor and the operation of the transmittingand receiving circuit, so as to extend and contract the antennaaccording to a control command.
 3. A mechanism for controlling anelectrically driven antenna comprising:a transmitting and receivingcircuit; an antenna motor power supply circuit operatively connected inparallel with the transmitting and receiving circuit; control means forresponding to commands, including a rotary contactor connected to theantenna motor power supply circuit and a rotatable switch plate in acase, said switch plate having a fixed contact, first and second movablecontacts; said first movable contact connected to a power switch of thetransmitting and receiving circuit; said second movable contactconnected to one pole of a supply power source through a changeoverswitch of a relay; said fixed contact connected to said supply powersource; and a manipulator located outside the case for operating atleast one of said movable contacts.
 4. A mechanism for controlling anelectrically driven antenna comprising:a transmitting and receivingcircuit; an antenna motor power circuit operatively connected inparallel with the transmitting and receiving circuit; independentcontrol means for responding to control commands from a manipulatingportion, including a rotary contactor and a motor for rotating therotary contactor, said independent control means located in the antennamotor power circuit; the manipulating portion for giving the controlcommands to said independent control means and adapted to presetselected values of antenna extension and contraction in said independentcontrol means; said independent control means including a motor circuithaving a variable resistor; and a changeover means for performing ON/OFFoperations of a current supply to the antenna motor power circuit, themotor for the independent control means together with the ON/OFFoperation of the transmitting and receiving circuit, so as to extend andcontract the antenna according to the control commands.
 5. A mechanismfor controlling an electrically driven antenna comprising:a transmittingand receiving circuit; an antenna motor power circuit operativelyconnected in parallel with the transmitting and receiving circuit;independent control means for responding to control commands, includinga drive motor and a power supply circuit for the drive motor; asupplemental circuit in the independent control means drive motor powersupply circuit including a resistor operatively connected in parallel toa diode; said independent control means drive motor being driven bypower supplied through the diode during extension of the antenna; saidindependent control means drive motor being driven by power suppliedthrough the resistor during contraction of the antenna, so that thepower during the antenna contraction is smaller than the power duringthe antenna extension; and changeover means for performing ON/OFFoperations of current to the antenna motor power circuit and theindependent control means drive motor, together with an ON/OFF operationof the transmitting and receiving circuit, so as to extend and contractthe antenna according to the control commands.
 6. A mechanism forcontrolling an electrically driven antenna as claimed in claim 5wherein:said resistor is a variable resistor which can quickly respondto every voltage variation due to particular motor characteristics,power source voltage and temperature change and to variable clutchoperating conditions from non-clutch operating conditions.
 7. Amechanism for controlling an electrically driven antenna comprising:anantenna motor; a power source; a transmitting and receiving mechanism,responsive to a control means; a control circuit for said control meansoperatively connected to said antenna motor and said power source; anA/D data memory operatively connected to said control circuit; acomparator operatively connected to the control circuit; a memorycircuit for the antenna's present position operatively connected to thecontrol circuit; and a DIP switch for functioning as a manipulatingportion operatively connected to said control circuit.